CN100475979C - Method for smelting suprelow carbon steel using ordinary arc furnace - Google Patents
Method for smelting suprelow carbon steel using ordinary arc furnace Download PDFInfo
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- CN100475979C CN100475979C CNB2006101351725A CN200610135172A CN100475979C CN 100475979 C CN100475979 C CN 100475979C CN B2006101351725 A CNB2006101351725 A CN B2006101351725A CN 200610135172 A CN200610135172 A CN 200610135172A CN 100475979 C CN100475979 C CN 100475979C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a smelting method of hyperlow-carbon steel in the common arc furnace, which comprises the following steps: loading; stripping phosphor under low temperature; stripping carbon under high temperature; sampling. The invention shortens the oxidizing time by one third, which can recycle heavy metal effectively.
Description
Technical field:
The present invention relates to a kind of method of utilizing the ordinary arc furnace smelting suprelow carbon steel.
Background technology:
Ordinary arc furnace is meant the electric arc furnace of eccentric bottom tapping, and the EBT type electric arc furnace alleged as the same industry, this kind electric arc furnace are for smelting a kind of metal smelting furnace that ordinary steel designs, so the furnace lining of this stove adopts the relatively low middle retaining magnesia carbon brick of price to build by laying bricks or stones.With this kind electric arc furnace smelting metal the time, because furnace lining contained carbon in the erosion of arc radiation that is subjected to electrode and slag is easy to brick is constantly separated, carbon in the molten steel can't be removed, so, the electric arc furnace of this kind structure can not melt out ultra low-carbon steel, and particularly not going out German grade of steel with this electric arc furnace smelting is X5CrNiCuNb16-4 blade steel; Simultaneously, because the contained carbon of furnace lining is constantly separated, causes shorten the work-ing life of electric arc furnace, and increased smelting cost.In the prior art, common vod process or argon gas oxygen decarburization method smelting suprelow carbon steel, as above-mentioned German grade of steel is X5CrNiCuNb16-4 type blade steel, and the cost of manufacture of these two kinds of employed smelting furnaces of method is quite high, for the unable procuring equipment of general Steel Plant.
Remelting of scrap steel-making is meant the main raw material(s) of the identical or akin steel scrap of material for making steel that utilizes with the steel of required melting, and by routine techniques it is melted out Finished Steel.Since in Ultra-low carbon blade steel to carbon, nonmetal content requirement such as phosphorus is very low, and refine ultra low-carbon steel with the remelting of scrap, for carbon can be met the requirements, all take the technology of high temperature oxidation decarburization, its temperature can reach more than 1800 ℃, and high temperature steel-making not only wastes energy, and also can bring bigger infringement to electric arc furnace, cause reduce the work-ing life of electric arc furnace, so in the prior art, adopt remelting of scrap smelting stainless steel usually, up to the present, also do not find to utilize the technology enlightenment of remelting of scrap smelting suprelow carbon steel, particularly utilize ordinary arc furnace to adopt the technology enlightenment of remelting of scrap smelting suprelow carbon steel again.
Summary of the invention:
Task of the present invention provides a kind of method of utilizing the ordinary arc furnace smelting suprelow carbon steel.
For finishing above-mentioned task, the method for utilizing the ordinary arc furnace smelting suprelow carbon steel proposed by the invention may further comprise the steps:
To the ordinary arc furnace transformation: at first the furnace chamber with furnace shell adopts carbon-free burning magnesia brick or fused cast refractories to build by laying bricks or stones, and eaf renovation is become carbon-free inwall; Charging: will hang down phosphoretic steel and return steel and pack in the electric arc furnace, and make low phosphoretic steel and the weight ratio returned between the steel is 1: 1.3--1.6; Low temperature dephosphorization: when the temperature in the electric arc furnace rises to 1480 ℃--in the time of 1530 ℃, in stove, carried out dephosphorization in oxygen blast 20-30 minute; The high temperature decarburization: when temperature in the electric arc furnace reaches more than 1600 ℃, carried out decarburization in oxygen blast 25-35 minute in the molten steel in electric arc furnace, the weight content that makes carbon in the molten steel is less than 0.03%; Sampling: after step is finished in the high temperature decarbonation process, take out the chemical examination of molten steel sample,,, add corresponding alloy, treat that its fusing back taps as undesirable as the tapping that meets the requirements of the alloy content in the molten steel.So-called low phosphoretic steel is meant that phosphorus is less than or equal to steel gross weight 0.005%, and carbon is less than or equal to a kind of steel scrap of steel gross weight 0.3%; Return steel and be meant the pre-identical or akin steel scrap of steel grade material of smelting with institute.
Also comprise the step of transforming electric arc furnace before the described charging step, the inwall that is about to furnace shell adopts carbon-free burning magnesia brick or electrically fused magnesite brick to build by laying bricks or stones.
In sampling procedure, when the weight content of carbon in the molten steel less than 0.03% the time, oxygen blast resampling chemical examination after 10 minutes again.
In the described charging step, also comprise the step of in electric arc furnace, adding earlier dephosphorizing agent, and then in electric arc furnace, pack into low phosphoretic steel with return steel, and to make weight ratio between the two be 1: 1.5.
Ultra low-carbon steel proposed by the invention is meant ability high temperature more than 600 ℃, bears a kind of steel of 30MPa pressure, as turbine blade steel (German grade of steel is X5CrNiCuNb16-4).
The method of utilizing the ordinary arc furnace smelting suprelow carbon steel proposed by the invention adopts the step of low temperature dephosphorization and high temperature decarburization, make oxidization time can shorten 1/3rd, also help the recovery of chromium metal simultaneously,, thereby can prolong the work-ing life of electric arc furnace because the temperature of dephosphorization is relatively low; In addition, adopt remelting of scrap smelting suprelow carbon steel can effectively utilize the noble metal that returns in the steel, thereby reduced the smelting cost of ultra low-carbon steel.
Embodiment:
Embodiment 1:
Present embodiment only is that EBT type electric arc furnace is elaborated, and with reference to this embodiment, there is not any obstacle in those of ordinary skill in the art with the ordinary arc furnace smelting suprelow carbon steel of other type.EBT type electric arc furnace has the furnace shell of band furnace chamber and is used to cover the bell of furnace chamber upper surface, before utilizing the electric arc furnace smelting ultra low-carbon steel of this type, at first the furnace chamber with furnace shell adopts carbon-free burning magnesia brick or fused cast refractories to build by laying bricks or stones, and eaf renovation is become carbon-free inwall.When smelting, in electric arc furnace, add the dephosphorizing agent (the adding quantity of dephosphorizing agent can and be returned the steel phosphorus content according to low phosphoretic steel and determine) of 1000-1500Kg earlier, and then in electric arc furnace, pack into low phosphoretic steel with return steel, and to make weight ratio between the two be 1: 1.5.After the electric arc furnace starting the arc, and temperature when rising to 1500 ℃ in it, carried out the low temperature dephosphorization in 25 minutes with inserting in the interior molten steel of oxygen lance in stove of electric arc furnace oxygen blast; And when temperature in the electric arc furnace reaches 1600 ℃, carried out the high temperature decarburization in 30 minutes with the molten steel oxygen blast of oxygen lance in electric arc furnace of inserting in the electric arc furnace again, and make the interior carbon content of molten steel less than 0.03% of molten steel gross weight, after the high temperature decarbonation process is finished, take out the chemical examination of molten steel sample, as the tapping that meets the requirements of the alloy content in the molten steel, as undesirable, add corresponding alloy, treat its fusing back tapping.
Low phosphoretic steel described in the embodiment 1 is meant that the content of phosphorus is less than or equal to steel gross weight 0.005% in the steel, and carbon is less than or equal to a kind of steel scrap of steel gross weight 0.3%; Return steel and be meant the pre-identical or akin steel scrap of steel grade material of smelting with institute.
Low phosphoretic steel among the embodiment 1 and the weight ratio of returning between the steel also can be 1: 1.3 or 1: 1.6 or 1: 1.4; In low temperature dephosphorization step, when electric arc furnace temperature reaches 1480 ℃ or 1530 ℃, carried out the low temperature dephosphorization in 20 minutes or 30 minutes with oxygen blast in the molten steel of oxygen lance in stove that inserts in the electric arc furnace again.
In the sampling procedure of embodiment 1, when the carbon content in the molten steel less than 0.03% the time, oxygen blast resampling chemical examination after 10 minutes again.
Claims (3)
1, utilize the method for ordinary arc furnace smelting suprelow carbon steel, it is characterized in that may further comprise the steps:
To the ordinary arc furnace transformation: at first the furnace chamber with furnace shell adopts carbon-free burning magnesia brick or fused cast refractories to build by laying bricks or stones, and eaf renovation is become carbon-free inwall;
Charging: will hang down phosphoretic steel and return steel and pack in the electric arc furnace, and make low phosphoretic steel and the weight ratio returned between the steel is 1: 1.3--1.6;
Low temperature dephosphorization: when the temperature in the electric arc furnace rises to 1480 ℃--in the time of 1530 ℃, in stove, carried out dephosphorization in oxygen blast 20-30 minute;
The high temperature decarburization: when temperature in the electric arc furnace reaches more than 1600 ℃, carried out decarburization in oxygen blast 25-35 minute in the molten steel in electric arc furnace, the weight content that makes carbon in the molten steel is less than 0.03%;
Sampling: after step is finished in the high temperature decarbonation process, take out the chemical examination of molten steel sample,,, add corresponding alloy, treat that its fusing back taps as undesirable as the tapping that meets the requirements of the alloy content in the molten steel.
2, method according to claim 1 is characterized in that: in sampling procedure, when the weight content of carbon in the molten steel less than 0.03% the time, oxygen blast resampling chemical examination after 10 minutes again.
3, method according to claim 1, it is characterized in that: in the described charging step, also comprise the step of in electric arc furnace, adding earlier dephosphorizing agent, and then in electric arc furnace, pack into low phosphoretic steel with return steel, and make low phosphoretic steel and the weight ratio returned between the steel is 1: 1.5.
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| CNB2006101351725A CN100475979C (en) | 2006-12-29 | 2006-12-29 | Method for smelting suprelow carbon steel using ordinary arc furnace |
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| CNB2006101351725A CN100475979C (en) | 2006-12-29 | 2006-12-29 | Method for smelting suprelow carbon steel using ordinary arc furnace |
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| CN1995406A CN1995406A (en) | 2007-07-11 |
| CN100475979C true CN100475979C (en) | 2009-04-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180363077A1 (en) * | 2017-06-16 | 2018-12-20 | University Of Science And Technology Beijing | Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101353753B (en) * | 2007-07-24 | 2010-08-11 | 宝山钢铁股份有限公司 | Ultra-low carbon high-purity industrial pure iron and manufacturing method thereof |
| CN102653807A (en) * | 2012-04-24 | 2012-09-05 | 本钢板材股份有限公司 | Method for smelting ultralow-carbon blade steel |
| CN102965467B (en) * | 2012-10-31 | 2013-12-11 | 德龙钢铁有限公司 | Low-cost efficient dephosphorization smelting process for electric arc furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1032823C (en) * | 1993-08-10 | 1996-09-18 | 北京科技大学 | Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1032823C (en) * | 1993-08-10 | 1996-09-18 | 北京科技大学 | Technology for smelting ultralow-carbon high-chromium alloyed steel by subaerated induction furnace |
Non-Patent Citations (4)
| Title |
|---|
| 武钢第二炼钢厂超低碳钢的生产实践. 张洪钢，陈清泉.武钢技术，第No.6期. 2003 |
| 武钢第二炼钢厂超低碳钢的生产实践. 张洪钢，陈清泉.武钢技术，第No.6期. 2003 * |
| 超低碳钢的冶炼技术. 武骏，林纲，李京社，郑宝茹.特殊钢，第Vol.17卷第No.2期. 1996 |
| 超低碳钢的冶炼技术. 武骏，林纲，李京社，郑宝茹.特殊钢，第Vol.17卷第No.2期. 1996 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180363077A1 (en) * | 2017-06-16 | 2018-12-20 | University Of Science And Technology Beijing | Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces |
| US10767239B2 (en) * | 2017-06-16 | 2020-09-08 | University Of Science And Technology Beijing | Production method for smelting clean steel from full-scrap steel using duplex electric arc furnaces |
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